MySQL 8.0 druid connection when calling Getservercharset Null pointer exception resolution method

Similar error messages are as follows:

16:52:01.163 [druid-connectionpool-create-1641320886] ERROR com.alibaba.druid.pool.druiddatasource-create Connection error, url:jdbc:mysql://localhost:3306/jf?useunicode=true&characterencoding=utf-8& Zerodatetimebehavior=converttonull&allowmultiqueries=true
Com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:Could not the Create connection to database server.

At Sun.reflect.GeneratedConstructorAccessor26.newInstance (Unknown Source) ~[?:?] At Sun.reflect.DelegatingConstructorAccessorImpl.newInstance (Delegatingconstructoraccessorimpl.java:45) ~[?:1.8.0_144]at java.lang.reflect.Constructor.newInstance (Constructor.java:423) ~[?:1.8.0_144]at com.mysql.jdbc.Util.handleNewInstance (Util.java:408) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.Util.getInstance (Util.java:383) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.SQLError.createSQLException (Sqlerror.java:1023) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.SQLError.createSQLException (Sqlerror.java:997) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.SQLError.createSQLException (Sqlerror.java:983) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.SQLError.createSQLException (Sqlerror.java:928) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.ConnectionImpl.connectOneTryOnly (Connectionimpl.java:2576) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.ConnectionImpl.createNewIO (Connectionimpl.java:2309) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.connectionimpl.<init> (Connectionimpl.java:834) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.jdbc4connection.<init> (Jdbc4connection.java:(~[mysql-connector-java-)5.1.32.jar:?] At Sun.reflect.GeneratedConstructorAccessor23.newInstance (Unknown Source) ~[?:?] At Sun.reflect.DelegatingConstructorAccessorImpl.newInstance (Delegatingconstructoraccessorimpl.java:45) ~[?:1.8.0_144]at java.lang.reflect.Constructor.newInstance (Constructor.java:423) ~[?:1.8.0_144]at com.mysql.jdbc.Util.handleNewInstance (Util.java:408) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.ConnectionImpl.getInstance (Connectionimpl.java:419) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.NonRegisteringDriver.connect (nonregisteringdriver.java:344) ~[ Mysql-connector-java-5.1.32.jar:?] At Com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection (Druidabstractdatasource.java:1375) ~[druid-1.0.11.jar:1.0.11]at Com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection (Druidabstractdatasource.java:1431) ~[druid-1.0.11.jar:1.0.11]at Com.alibaba.druid.pool.druiddatasource$createconnectionthread.run (Druiddatasource.java: 1857) [Druid-1.0.11.jar:1.0.11] 

caused by:java.lang.NullPointerException

At Com.mysql.jdbc.ConnectionImpl.getServerCharset (Connectionimpl.java:3299) ~[mysql-connector-java-5.1.32.jar:?]  At Com.mysql.jdbc.MysqlIO.sendConnectionAttributes (mysqlio.java:1967) ~[ Mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication (mysqlio.java: 1893) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.MysqlIO.doHandshake (mysqlio.java:1287) ~[mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.ConnectionImpl.coreConnect (connectionimpl.java:2494) ~[ Mysql-connector-java-5.1.32.jar:?] At Com.mysql.jdbc.ConnectionImpl.connectOneTryOnly (connectionimpl.java:2527) ~[ Mysql-connector-java-5.1.32.jar:?] ... 12 more             

The problem is not resolved on the Internet, the problem is solved by using MySQL connector version 8. So it should be a problem with the MySQL driver version. 8.0 some variations on the drive class and connection string are as follows:

Jdbc.driverclassname=com.mysql.cj.jdbc.driver
jdbc.url=jdbc:mysql://localhost:3306/k3c?useunicode=true&characterencoding=utf8&usessl=false& Servertimezone=hongkong

MySQL 8.0 druid connection when calling Getservercharset Null pointer exception resolution method